Optical imaging lens

ABSTRACT

An optical imaging lens may include a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the lens elements, the optical imaging lens may increase resolution, enlarge aperture stop and image height, and maintain well image quality.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.202111626317.2 titled “Optical Imaging Lens,” filed on Dec. 28, 2021,with the China National Intellectual Property Administration (CNIPA) ofthe People's Republic of China.

TECHNICAL FIELD

The present disclosure relates to optical imaging lenses, andparticularly, optical imaging lenses having, in some embodiments, eightlens elements.

BACKGROUND

As the specifications of mobile electronical devices rapidly evolve,various types of key components, such as optical imaging lenses, aredeveloped. Desirable objectives for designing an optical imaging lensmay not be limited to great aperture stop and compact sizes, but mayalso pursue high resolution. High resolution implies that an imageheight must be increased by using a greater image sensor acceptingimaging rays. Traditional designs providing an enlarged aperture stop tolet lens accept more imaging rays, but it will raise difficulty ofdesign. Increasing the number of pixel may force the resolution of lensto be raised, and if it is designed with a large aperture stop, it willmake the design more difficult. Accordingly, adding lens elements in alimit system length, promoting resolution and enlarging aperture stop,along with increasing image height in an optical imaging lens may be achallenge in the industry.

SUMMARY

In light of aforesaid problems, the present disclosure provides foroptical imaging lenses showing a slim and compact appearance, small Fno,great image height and good imaging quality.

In an example embodiment, an optical imaging lens may be used forshooting a video or picture in a mobile electronical device, such ascell phone, digital camera, tablet computer, personal digital assistant(PDA), etc. The optical imaging lens may comprise eight lens elements,hereinafter referred to as first, second, third, fourth, fifth, sixth,seventh and eighth lens elements and positioned sequentially from anobject side to an image side along an optical axis. Each of the first,second, third, fourth, fifth, sixth, seventh and eighth lens elementsmay also have an object-side surface facing toward the object side andallowing imaging rays to pass through. Each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements may also have animage-side surface facing toward the image side and allowing the imagingrays to pass through. Through configuration of convex/concave surfaceshape of the eight lens elements, the optical imaging lens may increaseresolution and enlarge aperture stop and image height at the same time.

In the specification, parameters used here are defined as follows: athickness of the first lens element along the optical axis isrepresented by T1, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e. an air gap between the first lens element and thesecond lens element along the optical axis, is represented by G12, athickness of the second lens element along the optical axis isrepresented by T2, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, i.e. an air gap between the second lens element andthe third lens element along the optical axis, is represented by G23, athickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, i.e. an air gap between the third lens element and thefourth lens element along the optical axis, is represented by G34, athickness of the fourth lens element along the optical axis isrepresented by T4, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, i.e. an air gap between the fourth lens element andthe fifth lens element along the optical axis, is represented by G45, athickness of the fifth lens element along the optical axis isrepresented by T5, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, i.e. an air gap between the fifth lens element and thesixth lens element along the optical axis, is represented by G56, athickness of the sixth lens element along the optical axis isrepresented by T6, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis, i.e. an air gap between the sixth lens elementand the seventh lens element along the optical axis, is represented byG67, a thickness of the seventh lens element along the optical axis isrepresented by T7, a distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis, i.e. an air gap between the seventh lens element andthe eighth lens element along the optical axis, is represented by G78, athickness of the eighth lens element along the optical axis isrepresented by T8, an air gap between the eighth lens element and afiltering unit along the optical axis is represented by G8F, a thicknessof the filtering unit along the optical axis is represented by TTF, anair gap between the filtering unit and an image plane along the opticalaxis is represented by GFP, a focal length of the first lens element isrepresented by f1, a focal length of the second lens element isrepresented by f2, a focal length of the third lens element isrepresented by f3, a focal length of the fourth lens element isrepresented by f4, a focal length of the fifth lens element isrepresented by f5, a focal length of the sixth lens element isrepresented by f6, a focal length of the seventh lens element isrepresented by f7, a focal length of the eighth lens element isrepresented by f8, a refractive index of the first lens element isrepresented by n1, a refractive index of the second lens element isrepresented by n2, a refractive index of the third lens element isrepresented by n3, a refractive index of the fourth lens element isrepresented by n4, a refractive index of the fifth lens element isrepresented by n5, a refractive index of the sixth lens element isrepresented by n6, a refractive index of the seventh lens element isrepresented by n7, a refractive index of the eighth lens element isrepresented by n8, an Abbe number of the first lens element isrepresented by V1, an Abbe number of the second lens element isrepresented by V2, an Abbe number of the third lens element isrepresented by V3, an Abbe number of the fourth lens element isrepresented by V4, an Abbe number of the fifth lens element isrepresented by V5, an Abbe number of the sixth lens element isrepresented by V6, an Abbe number of the seventh lens element isrepresented by V7, an Abbe number of the eighth lens element isrepresented by V8, a half field of view of the optical imaging lens isrepresented by HFOV, a f-number of the optical imaging lens isrepresented by Fno, an effective focal length of the optical imaginglens is represented by EFL, a distance from the object-side surface ofthe first lens element to the image plane along the optical axis, i.e. asystem length is represented by TTL, a sum of the thicknesses of alleight lens elements along the optical axis, i.e. a sum of T1, T2, T3,T4, T5, T6, T7 and T8 is represented by ALT, a sum of a distance fromthe image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis, a distancefrom the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis, adistance from the image-side surface of the third lens element to theobject-side surface of the fourth lens element along the optical axis, adistance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axisand a distance from the image-side surface of the seventh lens elementto the object-side surface of the eighth lens element along the opticalaxis, i.e. a sum of G12, G23, G34, G45, G56, G67 and G78 is representedby AAG, a back focal length of the optical imaging lens, which isdefined as the distance from the image-side surface of the eighth lenselement to the image plane along the optical axis, i.e. a sum of G8F,TTF and GFP is represented by BFL, a distance from the object-sidesurface of the first lens element to the image-side surface of theeighth lens element along the optical axis is represented by TL, animage height of the optical imaging lens is represented by ImgH, amaximum value of the seven air gaps from the first lens element to theeighth lens element along the optical axis is represented by Gmax, aminimum value of the seven air gaps from the first lens element to theeighth lens element along the optical axis is represented by Gmin, amaximum value of the eight thicknesses of lens elements from the firstlens element to the eighth lens element along the optical axis isrepresented by Tmax, and a minimum value of the eight thicknesses oflens elements from the first lens element to the eighth lens elementalong the optical axis is represented by Tmin.

In an aspect of the present disclosure, in the optical imaging lens, thesecond lens element has negative refracting power, and a peripheryregion of the object-side surface of the second lens element is convex,a periphery region of the object-side surface of the third lens elementis concave, the fourth lens element has negative refracting power, andan optical axis region of the object-side surface of the fourth lenselement is concave, the fifth lens element has positive refractingpower, and an optical axis region of the image-side surface of the fifthlens element is convex, an optical axis region of the object-sidesurface of the sixth lens element is concave, an optical axis region ofthe image-side surface of the eighth lens element is concave, and lenselements of the optical imaging lens are only the eight lens elements.

In another aspect of the present disclosure, in the optical imaginglens, the second lens element has negative refracting power, and aperiphery region of the image-side surface of the second lens element isconcave, a periphery region of the object-side surface of the third lenselement is concave, and an optical axis region of the image-side surfaceof the third lens element is convex, the fourth lens element hasnegative refracting power, and an optical axis region of the object-sidesurface of the fourth lens element is concave, an optical axis region ofthe image-side surface of the fifth lens element is convex, an opticalaxis region of the object-side surface of the sixth lens element isconcave, an optical axis region of the image-side surface of the eighthlens element is concave, and lens elements of the optical imaging lensare only the eight lens elements.

In yet another aspect of the present disclosure, in the optical imaginglens, the first lens element has positive refracting power, and aperiphery region of the image-side surface of the first lens element isconcave, the second lens element has negative refracting power, aperiphery region of the object-side surface of the third lens element isconcave, an optical axis region of the object-side surface of the fourthlens element is concave, an optical axis region of the image-sidesurface of the fifth lens element is convex, an optical axis region ofthe image-side surface of the sixth lens element is convex, and lenselements of the optical imaging lens are only the eight lens elements;and the optical imaging lens satisfies:

(G max−G min)/(T max−T min)≥1.500Inequality  (1).

In another example embodiment, other inequality(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example:

ALT/(T8+G max)≤3.300Inequality  (2);

ImgH/(T max−T min)≥10.500Inequality  (3);

(T7+G78+T8)/(G34+G45+G56+G67)≥2.000Inequality  (4);

(T1+T2+T3)/(G12+G23)≤4.000Inequality  (5);

(T5+T6+T7+T8)/G78≤3.200Inequality  (6);

AAG/(T5+T6)≤2.400Inequality  (7);

(T4+G45+T5)/(T3+G34)≥1.500Inequality  (8);

(T1+T5)/(G45+G67)≥2.200Inequality  (9);

V2+V4+V5≤113.000Inequality  (10);

G78/(G56+G67)≥1.700Inequality  (11);

EFL/(T4+T5+T8)≤4.300Inequality  (12);

TL/(T6+G67+T7+G78)≤3.400Inequality  (13);

(T2+T3+T4)/G23≤3.300Inequality  (14);

(T8+BFL)/(T2+G23)≤2.600Inequality  (15);

(T3+T4+T5+T6)/(G67+T7)≥2.200Inequality  (16);

(T4+T5)/(G34+G45)≥2.500Inequality  (17);

(T1+T2)/G67≥4.500Inequality  (18).

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated in example embodiments if no inconsistency occurs.

It is readily understood that through controlling the convex or concaveshape of the surfaces, the optical imaging lens of the present inventionmay provide for increased resolution, enlarged aperture stop and imageheight and good imaging quality.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a cross-sectional view showing the relation between theshape of a portion and the position where a collimated ray meets theoptical axis;

FIG. 3 depicts a cross-sectional view showing a first example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 4 depicts a cross-sectional view showing a second example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 5 depicts a cross-sectional view showing a third example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 7A-7D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 11A-11D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a second embodiment of the opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 15A-15D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a third embodiment of the opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 19A-19D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a fourth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 23A-23D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 27A-27D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a sixth embodiment of the opticalimaging lens according the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens of a sixth embodiment of the present disclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 31A-31D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of aseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 35A-35D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of an eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of aneighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of a ninth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 39A-39D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of a ninthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of a tenth embodiment of anoptical imaging lens according to the present disclosure;

FIGS. 43A-43D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a tenth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of a tenthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 45 depicts a table of aspherical data of a tenth embodiment of theoptical imaging lens according to the present disclosure;

FIGS. 46A, 46B and 46C depict tables for the values of(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of all ten exampleembodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons of ordinary skill in the arthaving the benefit of the present disclosure will understand othervariations for implementing embodiments within the scope of the presentdisclosure, including those specific examples described herein. Thedrawings are not limited to specific scale and similar reference numbersare used for representing similar elements. As used in the disclosuresand the appended claims, the terms “example embodiment,” “exemplaryembodiment,” and “present embodiment” do not necessarily refer to asingle embodiment, although it may, and various example embodiments maybe readily combined and interchanged, without departing from the scopeor spirit of the present disclosure. Furthermore, the terminology asused herein is for the purpose of describing example embodiments onlyand is not intended to be a limitation of the disclosure. In thisrespect, as used herein, the term “in” may include “in” and “on”, andthe terms “a”, “an” and “the” may include singular and pluralreferences. Furthermore, as used herein, the term “by” may also mean“from”, depending on the context. Furthermore, as used herein, the term“if” may also mean “when” or “upon”, depending on the context.Furthermore, as used herein, the words “and/or” may refer to andencompass any and all possible combinations of one or more of theassociated listed items.

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1 ). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1 , a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. A surface of the lens element 100 may have no transition pointor have at least one transition point. If multiple transition points arepresent on a single surface, then these transition points aresequentially named along the radial direction of the surface withreference numerals starting from the first transition point. Forexample, the first transition point, e.g., TP1, (closest to the opticalaxis I), the second transition point, e.g., TP2, (as shown in FIG. 4 ),and the Nth transition point (farthest from the optical axis I).

When a surface of the lens element has at least one transition point,the region of the surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest transition point (the Nth transition point) from theoptical axis I to the optical boundary OB of the surface of the lenselement is defined as the periphery region. In some embodiments, theremay be intermediate regions present between the optical axis region andthe periphery region, with the number of intermediate regions dependingon the number of the transition points. When a surface of the lenselement has no transition point, the optical axis region is defined as aregion of 0%-50% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element, and theperiphery region is defined as a region of 50%-100% of the distancebetween the optical axis I and the optical boundary OB of the surface ofthe lens element.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2 , optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2 . Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2 .

Accordingly, since the extension line EL of the ray intersects theoptical axis I on the object side A1 of the lens element 200, peripheryregion Z2 is concave. In the lens element 200 illustrated in FIG. 2 ,the first transition point TP1 is the border of the optical axis regionand the periphery region, i.e., TP1 is the point at which the shapechanges from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius of curvature” (the “R”value), which is the paraxial radius of shape of a lens surface in theoptical axis region. The R value is commonly used in conventionaloptical design software such as Zemax and CodeV. The R value usuallyappears in the lens data sheet in the software. For an object-sidesurface, a positive R value defines that the optical axis region of theobject-side surface is convex, and a negative R value defines that theoptical axis region of the object-side surface is concave. Conversely,for an image-side surface, a positive R value defines that the opticalaxis region of the image-side surface is concave, and a negative R valuedefines that the optical axis region of the image-side surface isconvex. The result found by using this method should be consistent withthe method utilizing intersection of the optical axis by rays/extensionlines mentioned above, which determines surface shape by referring towhether the focal point of a collimated ray being parallel to theoptical axis I is on the object-side or the image-side of a lenselement. As used herein, the terms “a shape of a region is convex(concave),” “a region is convex (concave),” and “a convex-(concave-)region,” can be used alternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3 , only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3 , since the shape of the optical axisregion Z1 is concave, the shape of the periphery region Z2 will beconvex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4 , a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4 , theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region of 0%-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion of 50%-100% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5 , the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

In the present disclosure, example embodiments of an optical imaginglens may comprise a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element. Each of thelens elements may comprise an object-side surface facing toward anobject side allowing imaging rays to pass through and an image-sidesurface facing toward an image side allowing the imaging rays to passthrough. These lens elements may be arranged sequentially from theobject side to the image side along an optical axis, and lens elementsof example embodiments of the lens are only the eight lens elements.Through controlling the convex or concave shape of the surfaces, theoptical imaging lens in example embodiments may provide for higherresolution along with enlarged aperture stop and image height.

Example embodiments of an optical imaging lens may be designed withconfiguration of refracting power and surface shapes, such as combiningnegative refracting power of the second lens element, a convex peripheryregion of the object-side surface of the second lens element and aconcave periphery region of the object-side surface of the third lenselement that may effectively adjust edge aberration. When the opticalimaging lens is further designed with negative refracting power of thefourth lens element, a concave optical axis region of the object-sidesurface of the fourth lens element, positive refracting power of thefifth lens element, a convex optical axis region of the image-sidesurface of the fifth lens element, a concave optical axis region of theobject-side surface of the sixth lens element and a concave peripheryregion of the image-side surface of the eighth lens element, imageheight may be effectively increased and curvature of field anddistortion may be effectively decreased. Additionally, when the opticalimaging lens is further designed with positive refracting power of thefirst lens element or negative refracting power of the eighth lenselement, system sensitivity may be declined.

Example embodiments of an optical imaging lens may be designed withconfiguration of refracting power and surface shapes, such as combiningnegative refracting power of the second lens element, a concaveperiphery region of the image-side surface of the second lens elementand a concave periphery region of the object-side surface of the thirdlens element that may effectively adjust edge aberration. When theoptical imaging lens is further designed with a convex optical axisregion of the image-side surface of the third lens element, negativerefracting power of the fourth lens element, a concave optical axisregion of the object-side surface of the fourth lens element, a convexoptical axis region of the image-side surface of the fifth lens element,a concave optical axis region of the object-side surface of the sixthlens element and a concave optical axis region of the image-side surfaceof the eighth lens element, image height may be effectively increased,longitudinal spherical aberration and distortion may be effectivelydecreased. Additionally, when the optical imaging lens is furtherdesigned with positive refracting power of the first lens element ornegative refracting power of the eighth lens element, system sensitivitymay be declined.

Example embodiments of an optical imaging lens may be designed withconfiguration of refracting power and surface shapes, such as combiningpositive refracting power of the first lens element and a concaveperiphery region of the image-side surface of the first lens elementthat may effectively adjust light path to avoid from excessive incidenceangle of light entering the second lens element that affects imagequality. When the optical imaging lens is further designed with negativerefracting power of the second lens element, a concave periphery regionof the object-side surface of the third lens element, a concave opticalaxis region of the object-side surface of the fourth lens element, aconvex optical axis region of the image-side surface of the fifth lenselement and a convex optical axis region of the image-side surface ofthe sixth lens element, image height may be effectively increased, andlongitudinal spherical aberration and distortion may be effectivelydecreased. When the optical imaging lens further satisfies(Gmax−Gmin)/(Tmax−Tmin)≥1.500, it may be designed with more eventhickness of lens element to provide shortened system length and goodproduction yield at the same time; preferably it may satisfy1.500≤(Gmax−Gmin)/(Tmax−Tmin)≤3.600. Additionally, when the opticalimaging lens is further designed with negative refracting power of thefourth lens element or negative refracting power of the eighth lenselement, f-number may be decreased.

When example embodiments of an optical imaging lens satisfy one of thefive combinations list below, good image quality may be provided: (a)positive refracting power of the seventh lens element or negativerefracting power of the eighth lens element; (b) positive refractingpower of the third lens element or negative refracting power of thefourth lens element; (c) negative refracting power of at least one ofthe third lens element, the fourth lens element or the fifth lenselement; (d) positive refracting power of at least one of the first lenselement, the third lens element or the fifth lens element; (e) negativerefracting power of the fourth lens element or positive refracting powerof the seventh lens element.

Example embodiments of an optical imaging lens may be designed withconfiguration of refracting power and surface shapes, such as combininga concave periphery region of the image-side surface of the first lenselement, a concave periphery region of the object-side surface of thethird lens element, a convex periphery region of the image-side surfaceof the fourth lens element, positive refracting power of the fifth lenselement, a concave optical axis region of the object-side surface of thefifth lens element, positive refracting power of the sixth lens element,a convex optical axis region of the image-side surface of the sixth lenselement and a concave optical axis region of the image-side surface ofthe seventh lens element that may carry out great image height, lowf-number and good image quality. When the optical imaging lens furthersatisfies (T7+G78+T8)/(G34+G45+G56+G67)≥2.000, it may be beneficial toprovide shortened system length and good production yield at the sametime; preferably it may satisfy2.000≤(T7+G78+T8)/(G34+G45+G56+G67)≤5.100.

Example embodiments of an optical imaging lens may be designed withconfiguration of refracting power and surface shapes, such as combininga concave periphery region of the image-side surface of the first lenselement, negative refracting power of the fourth lens element, a convexperiphery region of the image-side surface of the fourth lens element, aconcave optical axis region of the object-side surface of the fifth lenselement, positive refracting power of the sixth lens element, a concaveoptical axis region of the object-side surface of the sixth lenselement, positive refracting power of the seventh lens element, aconcave periphery region of the object-side surface of the seventh lenselement, accompanied with a concave periphery region of the object-sidesurface of the third lens element or a convex optical axis region of theimage-side surface of the third lens element, that may carry out greatimage height, low f-number and good image quality. When the opticalimaging lens further satisfies (T7+G78+T8)/(G34+G45+G56+G67)≥2.000, itmay be beneficial to provide shortened system length and good productionyield at the same time; preferably it may satisfy2.000≤(T7+G78+T8)/(G34+G45+G56+G67)≤5.100.

When example embodiments of an optical imaging lens satisfyV2+V4+V5≤113.000 through choosing proper materials, sensitivity of MTF(modulation transfer function) may be decreased and chromatic aberrationmay be improved; preferably, the optical imaging lens may satisfy90.000≤V2+V4+V5≤113.000.

When example embodiments of an optical imaging lens satisfyImgH/(Tmax−Tmin)≥10.500, great image height and shortened system lengthmay be offered due to even thickness of lens elements that improvesproduction yield; preferably, the optical imaging lens may satisfy10.500≤ImgH/(Tmax−Tmin)≤15.000.

When the optical imaging lens satisfies at least one of the inequalitieslisted below, the thickness of the lens elements and/or the air gapsbetween the lens elements may be shortened properly to avoid anyexcessive value of the parameters which may be unfavorable and maythicken the system length of the whole system of the optical imaginglens, and to avoid any insufficient value of the parameters which mayincrease the production difficulty of the optical imaging lens:

(T7+G78+T8)/(G34+G45+G56+G67)≥2.000, and preferably, the optical imaginglens may satisfy 2.000≤(T7+G78+T8)/(G34+G45+G56+G67)≤5.100;

(T1+T2+T3)/(G12+G23)≤4.000, and preferably, the optical imaging lens maysatisfy 1.700≤(T1+T2+T3)/(G12+G23)≤4.000;

(T5+T6+T7+T8)/G78≤3.200, and preferably, the optical imaging lens maysatisfy 1.300≤(T5+T6+T7+T8)/G78≤3.200;

AAG/(T5+T6)≤2.400, and preferably, the optical imaging lens may satisfy1.600≤AAG/(T5+T6)≤2.400;

(T4+G45+T5)/(T3+G34)≥1.500, and preferably, the optical imaging lens maysatisfy 1.500≤(T4+G45+T5)/(T3+G34)≤2.800;

(T1+T5)/(G45+G67)≥2.200, and preferably, the optical imaging lens maysatisfy 2.200≤(T1+T5)/(G45+G67)≤10.500;

G78/(G56+G67)≥1.700, and preferably, the optical imaging lens maysatisfy 1.700≤G78/(G56+G67)≤6.300;

EFL/(T4+T5+T8)≤4.300, and preferably, the optical imaging lens maysatisfy 2.800≤EFL/(T4+T5+T8)≤4.300;

ALT/(T8+Gmax)≤3.300, and preferably, the optical imaging lens maysatisfy 2.100≤ALT/(T8+Gmax)≤3.300;

TL/(T6+G67+T7+G78)≤3.400, and preferably, the optical imaging lens maysatisfy 2.300≤TL/(T6+G67+T7+G78)≤3.400;

(T2+T3+T4)/G23≤3.300, and preferably, the optical imaging lens maysatisfy 1.200≤(T2+T3+T4)/G23≤3.300;

(T8+BFL)/(T2+G23)≤2.600, and preferably, the optical imaging lens maysatisfy 0.700≤(T8+BFL)/(T2+G23)≤2.600;

(T3+T4+T5+T6)/(G67+T7)≥2.200, and preferably, the optical imaging lensmay satisfy 2.200≤(T3+T4+T5+T6)/(G67+T7)≤4.000;

(T4+T5)/(G34+G45)≥2.500, and preferably, the optical imaging lens maysatisfy 2.500≤(T4+T5)/(G34+G45)≤5.000;

(T1+T2)/G67≥4.500, and preferably, the optical imaging lens may satisfy4.500≤(T1+T2)/G67≤80.000;

AAG/(G23+T6)≤2.600, and preferably, the optical imaging lens may satisfy1.800≤AAG/(G23+T6)≤2.600.

In light of the unpredictability in an optical system, satisfying theseinequalities listed above may result in shortening the system length ofthe optical imaging lens, enlarging the image height, promoting theimaging quality and/or increasing the yield in the assembly process inthe present disclosure.

When implementing example embodiments, more details about the convex orconcave surface or refracting power could be incorporated for onespecific lens element or broadly for a plurality of lens elements toimprove the control for the system performance and/or resolution, orpromote the yield. For example, in an example embodiment, each lenselement may be made from all kinds of transparent material, such asglass, resin, etc. It is noted that the details listed here could beincorporated in example embodiments if no inconsistency occurs.

Several example embodiments and associated optical data will now beprovided for illustrating example embodiments of an optical imaging lenswith great optical quality, and enlarged field of view. Reference is nowmade to FIGS. 6-9 . FIG. 6 illustrates an example cross-sectional viewof an optical imaging lens 1 according to a first example embodiment.FIGS. 7A, 7B, 7C and 7D show example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 1 according to an example embodiment. FIG. 8 illustrates an exampletable of optical data of each lens element of the optical imaging lens 1according to an example embodiment. FIG. 9 depicts an example table ofaspherical data of the optical imaging lens 1 according to an exampleembodiment.

As shown in FIG. 6 , the optical imaging lens 1 of the presentembodiment may comprise, in the order from an object side A1 to an imageside A2 along an optical axis, an aperture stop STO, a first lenselement L1, a second lens element L2, a third lens element L3, a fourthlens element L4, a fifth lens element L5, a sixth lens element L6, aseventh lens element L7 and an eighth lens element L8. A filtering unitTF and an image plane IMA of an image sensor may be positioned at theimage side A2 of the optical lens 1. Each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements L1, L2, L3, L4,L5, L6, L7, L8 and the filtering unit TF may comprise an object-sidesurface L1A1/L2A1/L3A1/L4A1/L5A1/L6A1/L7A1/L8A1/TFA1 facing toward theobject side A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/L7A2/L8A2/TFA2 facing toward the imageside A2. The filtering unit TF, positioned between the eighth lenselement L8 and the image plane IMA, may selectively absorb light withspecific wavelength(s) from the light passing through optical imaginglens 1. The example embodiment of the filtering unit TF which mayselectively absorb light with specific wavelength(s) from the lightpassing through optical imaging lens 1 may be an IR cut filter (infraredcut filter). Then, IR light may be absorbed, and this may prohibit theIR light, which might not be seen by human eyes, from producing an imageon the image plane IMA.

Please refer to the drawings for the details of each lens element of theoptical imaging lens 1, which may be constructed by plastic material orother material for light weight.

In the first example embodiment, the first lens element L1 may havepositive refracting power. On the object-side surface L1A1, both anoptical axis region L1A1C and a periphery region L1A1P may be convex. Onthe image-side surface L1A2, both an optical axis region L1A2C and aperiphery region L1A2P may be concave.

The second lens element L2 may have negative refracting power. On theobject-side surface L2A1, both an optical axis region L2A1C and aperiphery region L2A1P may be convex.

On the image-side surface L2A2, both an optical axis region L2A2C and aperiphery region L2A2P may be concave.

The third lens element L3 may have positive refracting power. On theobject-side surface L3A1, an optical axis region L3A1C may be convex,and a periphery region L3A1P may be concave. On the image-side surfaceL3A2, both an optical axis region L3A2C and a periphery region L3A2P maybe convex.

The fourth lens element L4 may have negative refracting power. On theobject-side surface L4A1, both an optical axis region L4A1C and aperiphery region L4A1P may be concave. On the image-side surface L4A2,an optical axis region L4A2C may be concave, and a periphery regionL4A2P may be convex.

The fifth lens element L5 may have positive refracting power. On theobject-side surface L5A1, both an optical axis region L5A1C and aperiphery region L5A1P may be concave. On the image-side surface L5A2,both an optical axis region L5A2C and a periphery region L5A2P may beconvex.

The sixth lens element L6 may have positive refracting power. On theobject-side surface L6A1, both an optical axis region L6A1C and aperiphery region L6A1P may be concave. On the image-side surface L6A2,both an optical axis region L6A2C and a periphery region L6A2P may beconvex.

The seventh lens element L7 may have positive refracting power. On theobject-side surface L7A1, an optical axis region L7A1C may be convex anda periphery region L7A1P may be concave. On the image-side surface L7A2,an optical axis region L7A2C may be concave and a periphery region L7A2Pmay be convex.

The eighth lens element L8 may have negative refracting power. On theobject-side surface L8A1, an optical axis region L8A1C may be convex anda periphery region L8A1P may be concave. On the image-side surface L8A2,an optical axis region L8A2C may be concave and a periphery region L8A2Pmay be convex.

A total of 16 aspherical surfaces, including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7 and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula (1):

$\begin{matrix}{{Z(Y)} = {\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right){\sum\limits_{{\,_{+}i} = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}(1)}\end{matrix}$

wherein Z represents the depth of the aspherical surface (theperpendicular distance between the point of the aspherical surface at adistance Y from the optical axis and the tangent plane of the vertex onthe optical axis of the aspherical surface); R represents the radius ofcurvature of the surface of the lens element; Y represents theperpendicular distance between the point of the aspherical surface andthe optical axis; K represents a conic constant; a_(2i) represents anaspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9 .

Referring to FIG. 7A, a longitudinal spherical aberration of threerepresentative wavelengths (470 nm, 555 nm, 650 nm) of the opticalimaging lens 1 in the present embodiment is shown in coordinates inwhich a vertical axis represents field of view, and FIG. 7B, curvatureof field of three representative wavelengths (470 nm, 555 nm, 650 nm) ofthe optical imaging lens 1 in the present embodiment in the sagittaldirection is shown in coordinates in which a vertical axis representsimage height, and FIG. 7C, curvature of field in the tangentialdirection of three representative wavelengths (470 nm, 555 nm, 650 nm)of the optical imaging lens 1 in the present embodiment is shown incoordinates in which a vertical axis represents image height, and FIG.7D, distortion aberration of the optical imaging lens 1 in the presentembodiment is shown in coordinates in which a vertical axis representsimage height. The curve of each of these wavelengths may be close toeach other, and this represents that off-axis light with respect to thethree representative wavelengths (470 nm, 555 nm, 650 nm) may be focusedaround an image point. From the vertical deviation of each curve shownin FIG. 7A, the offset of the off-axis light relative to the image pointmay be within about −0.04˜0.03 mm. Therefore, the present embodimentimproves the longitudinal spherical aberration with respect to differentwavelengths certainly. Further, for curvature of field in the sagittaldirection shown in FIG. 7B, the focus variation with respect to thethree wavelengths in the whole field may fall within about −0.06˜0.02mm. For curvature of field in the tangential direction shown in FIG. 7C,the focus variation with respect to the three wavelengths in the wholefield may fall within about −0.06˜0.1 mm. The variation of thedistortion aberration shown in FIG. 7D may be within about 0˜5%.

As shown in FIG. 8 , the Fno the optical imaging lens 1 is 1.500, andthe image height is 5.850 mm. Referring to the aberration shown in FIGS.7A-7D, it may be readily understood that the optical imaging lens 1 iscapable to provide with enlarged aperture stop and image height, as wellas good optical characteristics.

Please also refer to FIGS. 46A and 46B for the values of each parameterand (T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 10-13 . FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 according to a secondexample embodiment. FIGS. 11A, 11B, 11C and 11D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 2 according to the second exampleembodiment. FIG. 12 shows an example table of optical data of each lenselement of the optical imaging lens 2 according to the second exampleembodiment. FIG. 13 shows an example table of aspherical data of theoptical imaging lens 2 according to the second example embodiment.

As shown in FIG. 10 , the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 andL8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2, and positive or negative configuration of the refractingpower of each lens element may be similar to those in the firstembodiment; however the radius of curvature, thickness of each lenselement, aspherical data and related optical parameters, such as backfocal length, may be different from those in the first embodiment.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 12 for the optical characteristicsof each lens elements in the optical imaging lens 2 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 11A, the offsetof the off-axis light relative to the image point may be within about−0.035˜0.025 mm. As the curvature of field in the sagittal directionshown in FIG. 11B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.05˜0.02 mm. Asthe curvature of field in the tangential direction shown in FIG. 11C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.04˜0.06 mm. As shown in FIG. 11D, thevariation of the distortion aberration may be within about −1˜4%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal andtangential directions of the optical imaging lens 2 may be smaller.

As shown in FIG. 12 , in the optical imaging lens 2, the Fno is 1.500and the image height is 5.601 mm. Referring to the aberration shown inFIGS. 11A-11D, it may be readily understood that the optical imaginglens 2 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46B for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 14-17 . FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 according to a thirdexample embodiment. FIGS. 15A, 15B, 15C and 15D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 3 according to the third example embodiment.FIG. 16 shows an example table of optical data of each lens element ofthe optical imaging lens 3 according to the third example embodiment.FIG. 17 shows an example table of aspherical data of the optical imaginglens 3 according to the third example embodiment.

As shown in FIG. 14 , the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L7A1 and L8A1 and theimage-side surfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2, andpositive or negative configuration of the refracting power of each lenselement may be similar to those in the first embodiment; however, theconfiguration of the concave/convex shape of the object-side surfacesL3A1, L5A1, L6A1 and the image-side surface L1A2 may be different fromthose in the first embodiment. Further, the radius of curvature andthickness of each lens element, aspherical data and related opticalparameters, such as back focal length, may be different from those inthe first embodiment. Specifically, an optical axis region L1A2C on theimage-side surface L1A2 of the first lens element L1 may be convex, anoptical axis region L3A1C on the object-side surface L3A1 of the thirdlens element L3 may be concave, a periphery region L5A1P on theobject-side surface L5A1 of the fifth lens element L5 may be convex, anda periphery region L6A1P on the object-side surface L6A1 of the sixthlens element L6 may be convex.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 16 for the optical characteristicsof each lens elements in the optical imaging lens 3 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 15A, the offsetof the off-axis light relative to the image point may be within about−0.007˜0.008 mm. As the curvature of field in the sagittal directionshown in FIG. 15B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.01˜0.025 mm. Asthe curvature of field in the tangential direction shown in FIG. 15C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.005˜0.015 mm. As shown in FIG. 15D, thevariation of the distortion aberration may be within about 0˜25%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal andtangential directions may be smaller in the present embodiment.

As shown in FIG. 16 , in the optical imaging lens 3, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 15A-15D, it may be readily understood that the optical imaginglens 3 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46B for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 18-21 . FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 according to a fourthexample embodiment. FIGS. 19A, 19B, 19C and 19D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 4 according to the fourth exampleembodiment. FIG. 20 shows an example table of optical data of each lenselement of the optical imaging lens 4 according to the fourth exampleembodiment. FIG. 21 shows an example table of aspherical data of theoptical imaging lens 4 according to the fourth example embodiment.

As shown in FIG. 18 , the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L5A1, L6A1, L7A1 and L8A1 andthe image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L7A2 and L8A2, andpositive or negative configuration of the refracting power of each lenselement may be similar to those in the first embodiment; however, theconfiguration of the concave/convex shape of the object-side surfaceL3A1 and the image-side surface L6A2 may be different from those in thefirst embodiment. Further, the radius of curvature and thickness of eachlens element, aspherical data and related optical parameters, such asback focal length, may be different from those in the first embodiment.Specifically, an optical axis region L3A1C on the object-side surfaceL3A1 of the third lens element L3 may be concave, and a periphery regionL6A2P on the image-side surface L6A2 of the sixth lens element L6 may beconcave.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 20 for the optical characteristicsof each lens elements in the optical imaging lens 4 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 19A, the offsetof the off-axis light relative to the image point may be within about−0.012˜0.012 mm. As the curvature of field in the sagittal directionshown in FIG. 19B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.015˜0.015 mm. Asthe curvature of field in the tangential direction shown in FIG. 19C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.015˜0.045 mm. As shown in FIG. 19D, thevariation of the distortion aberration may be within about 0˜18%.

As shown in FIG. 20 , in the optical imaging lens 4, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 19A-19D, it may be readily understood that the optical imaginglens 4 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46B for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 22-25 . FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 according to a fifthexample embodiment. FIGS. 23A, 23B, 23C and 23D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 5 according to the fifth example embodiment.FIG. 24 shows an example table of optical data of each lens element ofthe optical imaging lens 5 according to the fifth example embodiment.FIG. 25 shows an example table of aspherical data of the optical imaginglens 5 according to the fifth example embodiment.

As shown in FIG. 22 , the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 andL8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L7A2 andL8A2, and positive or negative configuration of the refracting power ofeach lens element other than the fifth lens element L5 may be similar tothose in the first embodiment; however, the configuration of theconcave/convex shape of the image-side surface L6A2 and the negativerefracting power of the fifth lens element L5 may be different fromthose in the first embodiment. Further, the radius of curvature andthickness of each lens element, aspherical data and related opticalparameters, such as back focal length, may be different from those inthe first embodiment. Specifically, a periphery region L6A2P on theimage-side surface L6A2 of the sixth lens element L6 may be concave.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 24 for the optical characteristicsof each lens elements in the optical imaging lens 5 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 23A, the offsetof the off-axis light relative to the image point may be within about−0.008˜0.01 mm. As the curvature of field in the sagittal directionshown in FIG. 23B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.015˜0.025 mm. Asthe curvature of field in the tangential direction shown in FIG. 23C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.01˜0.025 mm. As shown in FIG. 23D, thevariation of the distortion aberration may be within about 0˜16%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal andtangential directions may be smaller in the present embodiment.

As shown in FIG. 24 , in the optical imaging lens 5, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 23A-23D, it may be readily understood that the optical imaginglens 5 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46B for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 26-29 . FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 according to a sixthexample embodiment. FIGS. 27A, 27B, 27C and 27D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 6 according to the sixth example embodiment.FIG. 28 shows an example table of optical data of each lens element ofthe optical imaging lens 6 according to the sixth example embodiment.FIG. 29 shows an example table of aspherical data of the optical imaginglens 6 according to the sixth example embodiment.

As shown in FIG. 26 , the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L5A1, L6A1, L7A1 and L8A1 andthe image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 andL8A2, and positive or negative configuration of the refracting power ofeach lens element other than the sixth lens element L6 may be similar tothose in the first embodiment; however, the configuration of theconcave/convex shape of the object-side surface L3A1 and the negativerefracting power of the six lens element L6 may be different from thosein the first embodiment. Further, the radius of curvature and thicknessof each lens element, aspherical data and related optical parameters,such as back focal length, may be different from those in the firstembodiment. Specifically, an optical axis region L3A1C on theobject-side surface L3A1 of the third lens element L3 may be concave.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 28 for the optical characteristicsof each lens elements in the optical imaging lens 6 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 27A, the offsetof the off-axis light relative to the image point may be within about−0.01˜0.012 mm. As the curvature of field in the sagittal directionshown in FIG. 27B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.015˜0.025 mm. Asthe curvature of field in the tangential direction shown in FIG. 27C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.01˜0.025 mm. As shown in FIG. 27D, thevariation of the distortion aberration may be within about 0˜16%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal andtangential directions may be smaller in the present embodiment.

As shown in FIG. 28 , in the optical imaging lens 6, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 27A-27D, it may be readily understood that the optical imaginglens 6 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46C for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 30-33 . FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 according to a seventhexample embodiment. FIGS. 31A, 31B, 31C and 31D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 7 according to the seventh exampleembodiment. FIG. 32 shows an example table of optical data of each lenselement of the optical imaging lens 7 according to the seventh exampleembodiment. FIG. 33 shows an example table of aspherical data of theoptical imaging lens 7 according to the seventh example embodiment.

As shown in FIG. 30 , the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 andL8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2, and positive or negative configuration of the refractingpower of each lens element may be similar to those in the firstembodiment; however, the radius of curvature and thickness of each lenselement, aspherical data and related optical parameters, such as backfocal length, may be different from those in the first embodiment.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 32 for the optical characteristicsof each lens elements in the optical imaging lens 7 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 31A, the offsetof the off-axis light relative to the image point may be within about−0.007˜0.01 mm. As the curvature of field in the sagittal directionshown in FIG. 31B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.02˜0.035 mm. Asthe curvature of field in the tangential direction shown in FIG. 31C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.015˜0.02 mm. As shown in FIG. 31D, thevariation of the distortion aberration may be within about 0˜18%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal andtangential directions may be smaller in the present embodiment.

As shown in FIG. 32 , in the optical imaging lens 7, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 31A-31D, it may be readily understood that the optical imaginglens 7 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46C for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 34-37 . FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 according to an eighthexample embodiment. FIGS. 35A, 35B, 35C and 35D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 8 according to the eighth exampleembodiment. FIG. 36 shows an example table of optical data of each lenselement of the optical imaging lens 8 according to the eighth exampleembodiment. FIG. 37 shows an example table of aspherical data of theoptical imaging lens 8 according to the eighth example embodiment.

As shown in FIG. 34 , the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L5A1, L7A1 and L8A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2,and positive or negative configuration of the refracting power of eachlens element may be similar to those in the first embodiment; however,the configuration of the concave/convex shape of the object-sidesurfaces L3A1, L6A1 may be different from those in the first embodiment.Further, the radius of curvature and thickness of each lens element,aspherical data and related optical parameters, such as back focallength, may be different from those in the first embodiment.Specifically, an optical axis region L3A1C on the object-side surfaceL3A1 of the third lens element L3 may be concave, and a periphery regionL6A1P on the object-side surface L6A1 of the sixth lens element L6 maybe convex.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 36 for the optical characteristicsof each lens elements in the optical imaging lens 8 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 35A, the offsetof the off-axis light relative to the image point may be within about−0.005˜0.01 mm. As the curvature of field in the sagittal directionshown in FIG. 35B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.01˜0.025 mm. Asthe curvature of field in the tangential direction shown in FIG. 35C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.005˜0.02 mm. As shown in FIG. 35D, thevariation of the distortion aberration may be within about 0˜18%.Compared with the first embodiment, the longitudinal sphericalaberration and the curvature of field in both the sagittal and thetangential directions may be smaller in the present embodiment.

As shown in FIG. 36 , in the optical imaging lens 8, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 35A-35D, it may be readily understood that the optical imaginglens 8 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46C for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 38-41 . FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 according to a ninthexample embodiment. FIGS. 39A, 39B, 39C and 39D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 9 according to the ninth example embodiment.FIG. 40 shows an example table of optical data of each lens element ofthe optical imaging lens 9 according to the ninth example embodiment.FIG. 41 shows an example table of aspherical data of the optical imaginglens 9 according to the ninth example embodiment.

As shown in FIG. 38 , the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L6A1, L7A1 and L8A1 and theimage-side surfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2, andpositive or negative configuration of the refracting power of each lenselement other than the third lens element L3 may be similar to those inthe first embodiment; however, the configuration of the concave/convexshape of the object-side surfaces L3A1, L5A1 and he image-side surfaceL1A2 and the negative refracting power of the third lens element L3 maybe different from those in the first embodiment. Further, the radius ofcurvature and thickness of each lens element, aspherical data andrelated optical parameters, such as back focal length, may be differentfrom those in the first embodiment. Specifically, an optical axis regionL1A2C on the image-side surface L1A2 of the first lens element L1 may beconvex, an optical axis region L3A1C on the object-side surface L3A1 ofthe third lens element L3 may be concave, and a periphery region L5A1Pon the object-side surface L5A1 of the fifth lens element L5 may beconvex.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 40 for the optical characteristicsof each lens elements in the optical imaging lens 9 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 39A, the offsetof the off-axis light relative to the image point may be within about−0.016˜0.012 mm. As the curvature of field in the sagittal directionshown in FIG. 39B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.02˜0.015 mm. Asthe curvature of field in the tangential direction shown in FIG. 39C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.015˜0.05 mm. As shown in FIG. 39D, thevariation of the distortion aberration may be within about 0˜35%.Compared with the first embodiment, the curvature of field in thetangential direction may be smaller in the present embodiment.

As shown in FIG. 40 , in the optical imaging lens 9, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 39A-39D, it may be readily understood that the optical imaginglens 9 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46C for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Reference is now made to FIGS. 42-45 . FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 according to a tenthexample embodiment. FIGS. 43A, 43B, 43C and 43D show example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 10 according to the tenth exampleembodiment. FIG. 44 shows an example table of optical data of each lenselement of the optical imaging lens 10 according to the tenth exampleembodiment. FIG. 45 shows an example table of aspherical data of theoptical imaging lens 10 according to the tenth example embodiment.

As shown in FIG. 42 , the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The configuration of the concave/convex shape of surfaces, comprisingthe object-side surfaces L1A1, L2A1, L4A1, L6A1, L7A1 and L8A1 and theimage-side surfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2, andpositive or negative configuration of the refracting power of each lenselement other than the seventh lens element L7 may be similar to thosein the first embodiment; however, the configuration of theconcave/convex shape of object-side surfaces L3A1, L5A1 and theimage-side surface L1A2 and the negative refracting power of the seventhlens element L7 may be different from those in the first embodiment.Further, the radius of curvature and thickness of each lens element,aspherical data and related optical parameters, such as back focallength, may be different from those in the first embodiment.Specifically, an optical axis region L1A2C on the image-side surfaceL1A2 of the first lens element L1 may be convex, an optical axis regionL3A1C on the object-side surface L3A1 of the third lens element L3 maybe concave, and a periphery region L5A1P on the object-side surface L5A1of the fifth lens element L5 may be convex.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentmay be labeled. Please refer to FIG. 44 for the optical characteristicsof each lens elements in the optical imaging lens 10 of the presentembodiment.

As the longitudinal spherical aberration shown in FIG. 43A, the offsetof the off-axis light relative to the image point may be within about−0.005˜0.025 mm. As the curvature of field in the sagittal directionshown in FIG. 43B, the focus variation with regard to the threewavelengths in the whole field may fall within about −0.015˜0.015 mm. Asthe curvature of field in the tangential direction shown in FIG. 43C,the focus variation with regard to the three wavelengths in the wholefield may fall within about −0.005˜0.05 mm. As shown in FIG. 43D, thevariation of the distortion aberration may be within about 0˜35%.Compared with the first embodiment, the longitudinal sphericalaberration may be smaller in the present embodiment.

As shown in FIG. 44 , in the optical imaging lens 10, the Fno is 1.500and the image height is 6.200 mm. Referring to the aberration shown inFIGS. 43A-43D, it may be readily understood that the optical imaginglens 10 is capable to provide with enlarged aperture stop and imageheight, as well as good imaging quality.

Please refer to FIGS. 46A and 46C for the values of each parameter and(T7+G78+T8)/(G34+G45+G56+G67), (Gmax−Gmin)/(Tmax−Tmin),(T1+T2+T3)/(G12+G23), (T5+T6+T7+T8)/G78, AAG/(T5+T6),(T4+G45+T5)/(T3+G34), (T1+T5)/(G45+G67), V2+V4+V5, G78/(G56+G67),EFL/(T4+T5+T8), ALT/(T8+Gmax), TL/(T6+G67+T7+G78), (T2+T3+T4)/G23,(T8+BFL)/(T2+G23), (T3+T4+T5+T6)/(G67+T7), (T4+T5)/(G34+G45),(T1+T2)/G67, ImgH/(Tmax−Tmin) and AAG/(G23+T6) of the presentembodiment.

Any range of which upper and lower limits, including the upper and lowerlimits, defined by the values disclosed in all of the embodiments hereinmay be implemented in the present embodiments.

According to above illustration, the longitudinal spherical aberration,field curvature in both the sagittal direction and tangential directionand distortion aberration in all embodiments may meet the userrequirement of a related product in the market. The off-axis light withregard to three different wavelengths may be focused around an imagepoint and the offset of the off-axis light relative to the image pointmay be well controlled with suppression for the longitudinal sphericalaberration, field curvature both in the sagittal direction andtangential direction and distortion aberration. The curves of differentwavelengths may be close to each other, and this represents that thefocusing for light having different wavelengths may be good to suppresschromatic dispersion. In summary, lens elements are designed and matchedfor achieving good imaging quality.

The contents in the embodiments of the invention include but are notlimited to a focal length, a thickness of a lens element, an Abbenumber, or other optical parameters. For example, in the embodiments ofthe invention, an optical parameter A and an optical parameter B aredisclosed, wherein the ranges of the optical parameters, comparativerelation between the optical parameters, and the range of a conditionalexpression covered by a plurality of embodiments are specificallyexplained as follows:

(1) The ranges of the optical parameters are, for example, α₂≤A≤α₁ orβ₂≤B≤β₁, where α₁ is a maximum value of the optical parameter A amongthe plurality of embodiments, α₂ is a minimum value of the opticalparameter A among the plurality of embodiments, β₁ is a maximum value ofthe optical parameter B among the plurality of embodiments, and β₂ is aminimum value of the optical parameter B among the plurality ofembodiments.(2) The comparative relation between the optical parameters is that A isgreater than B or A is less than B, for example.(3) The range of a conditional expression covered by a plurality ofembodiments is in detail a combination relation or proportional relationobtained by a possible operation of a plurality of optical parameters ineach same embodiment. The relation is defined as E, and E is, forexample, A+B or A-B or A/B or A*B or (A*B)^(1/2), and E satisfies aconditional expression E≤γ₁ or E≥γ₂ or γ₂≤E≤γ₁, where each of γ₁ and γ₂is a value obtained by an operation of the optical parameter A and theoptical parameter B in a same embodiment, γ₁ is a maximum value amongthe plurality of the embodiments, and γ₂ is a minimum value among theplurality of the embodiments.The ranges of the aforementioned optical parameters, the aforementionedcomparative relations between the optical parameters, and a maximumvalue, a minimum value, and the numerical range between the maximumvalue and the minimum value of the aforementioned conditionalexpressions are all implementable and all belong to the scope disclosedby the invention. The aforementioned description is for exemplaryexplanation, but the invention is not limited thereto.

The embodiments of the invention are all implementable. In addition, acombination of partial features in a same embodiment can be selected,and the combination of partial features can achieve the unexpectedresult of the invention with respect to the prior art. The combinationof partial features includes but is not limited to the surface shape ofa lens element, a refracting power, a conditional expression or thelike, or a combination thereof. The description of the embodiments isfor explaining the specific embodiments of the principles of theinvention, but the invention is not limited thereto. Specifically, theembodiments and the drawings are for exemplifying, but the invention isnot limited thereto.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the secondlens element has negative refracting power, and a periphery region ofthe object-side surface of the second lens element is convex; aperiphery region of the object-side surface of the third lens element isconcave; the fourth lens element has negative refracting power, and anoptical axis region of the object-side surface of the fourth lenselement is concave; the fifth lens element has positive refractingpower, and an optical axis region of the image-side surface of the fifthlens element is convex; an optical axis region of the object-sidesurface of the sixth lens element is concave; an optical axis region ofthe image-side surface of the eighth lens element is concave; and lenselements of the optical imaging lens are only the eight lens elements.2. The optical imaging lens according to claim 1, a sum of thethicknesses of all eight lens elements along the optical axis isrepresented by ALT, a thickness of the eighth lens element along theoptical axis is represented by T8, a maximum value of seven air gapsfrom the first lens element to the eighth lens element along the opticalaxis is represented by Gmax, and ALT, T8 and Gmax satisfy theinequality:ALT/(T8+G max)≤3.300.
 3. The optical imaging lens according to claim 1,an image height of the optical imaging lens is represented by ImgH, amaximum value of the eight thicknesses of lens elements from the firstlens element to the eighth lens element along the optical axis isrepresented by Tmax, and a minimum value of the eight thicknesses oflens elements from the first lens element to the eighth lens elementalong the optical axis is represented by Tmin, and ImgH, Tmax and Tminsatisfy the inequality:ImgH/(T max−T min)≥10.500.
 4. The optical imaging lens according toclaim 1, wherein a thickness of the seventh lens element along theoptical axis is represented by T7, a distance from the image-sidesurface of the seventh lens element to the object-side surface of theeighth lens element along the optical axis is represented by G78, athickness of the eighth lens element along the optical axis isrepresented by T8, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis is represented by G34, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis is represented by G45, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis isrepresented by G56, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis is represented by G67, and T7, G78, T8, G34, G45,G56 and G67 satisfy the inequality:(T7+G78+T8)/(G34+G45+G56+G67)≥2.000.
 5. The optical imaging lensaccording to claim 1, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the secondlens element along the optical axis is represented by T2, a thickness ofthe third lens element along the optical axis is represented by T3, adistance from the image-side surface of the first lens element to theobject-side surface of the second lens element along the optical axis isrepresented by G12, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23, and T1, T2, T3, G12 and G23satisfy the inequality:(T1+T2+T3)/(G12+G23)≤4.000.
 6. The optical imaging lens according toclaim 1, wherein a thickness of the fifth lens element along the opticalaxis is represented by T5, a thickness of the sixth lens element alongthe optical axis is represented by T6, a thickness of the seventh lenselement along the optical axis is represented by T7, a thickness of theeighth lens element along the optical axis is represented by T8, adistance from the image-side surface of the seventh lens element to theobject-side surface of the eighth lens element along the optical axis isrepresented by G78, and T5, T6, T7, T8 and G78 satisfy the inequality:(T5+T6+T7+T8)/G78≤3.200.
 7. The optical imaging lens according to claim1, wherein a sum of a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis and a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by AAG, a thickness of thefifth lens element along the optical axis is represented by T5, athickness of the sixth lens element along the optical axis isrepresented by T6, and AAG, T5 and T6 satisfy the inequality:AAG/(T5+T6)≤2.400.
 8. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the secondlens element has negative refracting power, and a periphery region ofthe image-side surface of the second lens element is concave; aperiphery region of the object-side surface of the third lens element isconcave, and an optical axis region of the image-side surface of thethird lens element is convex; the fourth lens element has negativerefracting power, and an optical axis region of the object-side surfaceof the fourth lens element is concave; an optical axis region of theimage-side surface of the fifth lens element is convex; an optical axisregion of the object-side surface of the sixth lens element is concave;an optical axis region of the image-side surface of the eighth lenselement is concave; and lens elements of the optical imaging lens areonly the eight lens elements.
 9. The optical imaging lens according toclaim 8, wherein a thickness of the fourth lens element along theoptical axis is represented by T4, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis is represented by G45, athickness of the fifth lens element along the optical axis isrepresented by T5, a thickness of the third lens element along theoptical axis is represented by T3, a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34, andT4, G45, T5, T3 and G34 satisfy the inequality:(T4+G45+T5)/(T3+G34)≥1.500.
 10. The optical imaging lens according toclaim 8, wherein a thickness of the first lens element along the opticalaxis is represented by T1, a thickness of the fifth lens element alongthe optical axis is represented by T5, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis is represented by G45, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axisis represented by G67, and T1, T5, G45 and G67 satisfy the inequality:(T1+T5)/(G45+G67)≥2.200.
 11. The optical imaging lens according to claim8, wherein an abbe number of the second lens element is represented byV2, an abbe number of the fourth lens element is represented by V4, anabbe number of the fifth lens element is represented by V5, and V2, V4and V5 satisfy the inequality:V2+V4+V5≤113.000.
 12. The optical imaging lens according to claim 8,wherein a distance from the image-side surface of the seventh lenselement to the object-side surface of the eighth lens element along theoptical axis is represented by G78, a distance from the image-sidesurface of the fifth lens element to the object-side surface of thesixth lens element along the optical axis is represented by G56, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axisis represented by G67, and G78, G56 and G67 satisfy the inequality:G78/(G56+G67)≥1.700.
 13. The optical imaging lens according to claim 8,wherein an effective focal length of the optical imaging lens isrepresented by EFL, a thickness of the fourth lens element along theoptical axis is represented by T4, a thickness of the fifth lens elementalong the optical axis is represented by T5, a thickness of the eighthlens element along the optical axis is represented by T8, and EFL, T4,T5 and T8 satisfy the inequality:EFL/(T4+T5+T8)≤4.300.
 14. The optical imaging lens according to claim 8,wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a thickness of the sixth lens elementalong the optical axis is represented by T6, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis is represented byG67, a thickness of the seventh lens element along the optical axis isrepresented by T7, a distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis is represented by G78, and TL, T6, G67, T7 and G78satisfy the inequality:TL/(T6+G67+T7+G78)≤3.400.
 15. An optical imaging lens, comprising afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element sequentially from anobject side to an image side along an optical axis, each of the first,second, third, fourth, fifth, sixth, seventh and eighth lens elementshaving an object-side surface facing toward the object side and allowingimaging rays to pass through and an image-side surface facing toward theimage side and allowing the imaging rays to pass through, wherein: thefirst lens element has positive refracting power, and a periphery regionof the image-side surface of the first lens element is concave; thesecond lens element has negative refracting power; a periphery region ofthe object-side surface of the third lens element is concave; an opticalaxis region of the object-side surface of the fourth lens element isconcave; an optical axis region of the image-side surface of the fifthlens element is convex; an optical axis region of the image-side surfaceof the sixth lens element is convex; and lens elements of the opticalimaging lens are only the eight lens elements; and a maximum value ofthe seven air gaps from the first lens element to the eighth lenselement along the optical axis is represented by Gmax, a minimum valueof the seven air gaps from the first lens element to the eighth lenselement along the optical axis is represented by Gmin, a maximum valueof the eight thicknesses of lens elements from the first lens element tothe eighth lens element along the optical axis is represented by Tmax,and a minimum value of the eight thicknesses of lens elements from thefirst lens element to the eighth lens element along the optical axis isrepresented by Tmin, and the optical imaging lens satisfies:(G max−G min)/(T max−T min)≥1.500.
 16. The optical imaging lensaccording to claim 15, wherein a thickness of the second lens elementalong the optical axis is represented by T2, a thickness of the thirdlens element along the optical axis is represented by T3, a thickness ofthe fourth lens element along the optical axis is represented by T4, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis isrepresented by G23, and T2, T3, T4 and G23 satisfy the inequality:(T2+T3+T4)/G23≤3.300.
 17. The optical imaging lens according to claim15, wherein a thickness of the eighth lens element along the opticalaxis is represented by T8, a distance from the image-side surface of theeighth lens element to an image plane along the optical axis isrepresented by BFL, a thickness of the second lens element along theoptical axis is represented by T2, a distance from the image-sidesurface of the second lens element to the object-side surface of thethird lens element along the optical axis is represented by G23, and T8,BFL, T2 and G23 satisfy the inequality:(T8+BFL)/(T2+G23)≤2.600.
 18. The optical imaging lens according to claim15, wherein a thickness of the third lens element along the optical axisis represented by T3, a thickness of the fourth lens element along theoptical axis is represented by T4, a thickness of the fifth lens elementalong the optical axis is represented by T5, a thickness of the sixthlens element along the optical axis is represented by T6, a distancefrom the image-side surface of the sixth lens element to the object-sidesurface of the seventh lens element along the optical axis isrepresented by G67, a thickness of the seventh lens element along theoptical axis is represented by T7, and T3, T4, T5, T6, G67 and T7satisfy the inequality:(T3+T4+T5+T6)/(G67+T7)≥2.200.
 19. The optical imaging lens according toclaim 15, wherein a thickness of the fourth lens element along theoptical axis is represented by T4, a thickness of the fifth lens elementalong the optical axis is represented by T5, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34,a distance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis isrepresented by G45, and T4, T5, G34 and G45 satisfy the inequality:(T4+T5)/(G34+G45)≥2.500.
 20. The optical imaging lens according to claim15, wherein a thickness of the first lens element along the optical axisis represented by T1, a thickness of the second lens element along theoptical axis is represented by T2, a distance from the image-sidesurface of the sixth lens element to the object-side surface of theseventh lens element along the optical axis is represented by G67, andT1, T2 and G67 satisfy the inequality:(T1+T2)/G67≥4.500.